Hair-trigger mechanism for smallarms



P 'H 1935- R. VON #RQMMER 1,997,954

HAIR TRIGGER MECHANISM FOR SMALLARMS Filed Sept. 30, 1933 2 Sheets-Sheet 1 r I Fig.1. 29 23 73 Fig.6.

fi km g n 41 1mm" April 16, 1935. R. VON FROMMER I 1,997,954

HAIR TRIGGER MECHANISM FOR SMALLARMS Filed Sept. 50, 1933 2 Sheets-Sheet 2 Patented Apr. 16, 1935 I "r I g I ,j UNITED; TAT {PATENT I "QFFIECE Q 4 f u 51,997,954 H 1 a 1 1 HAIR-TRIGGER MECHAhlISM FOR SM A M Rudolfvon Frommer, Budapest. Hungary j j i Application September so, 1953, Serial Ne. 691,695 A Inllungary October 4, 1932 1 ii olai n'. -(ol. 42-59 The invention relates to improvementsiinhairclockwise, so that the striker 23 is pushed back 7 triggermechanisms for smallarms, at which the against the action of coil spring 24 and the arm sear of the trigger mechanism is held disengaged 1 22 is Caught under the hook whereby the fromthemember adapted to release the striker [striker of the hair-trigger is cocked and the trigmember or the hammer} if the trigger-mechanism 'ger action is ready for firing. At the same time 5 is cockedand the hair-trigger mechanism unthe sear 8 is pushed back under the action of cocked, whereby the smallarrn cannot bedisthe spri p e e p g wh r y h r charged while the hair-trigger mechanism is un- 0 *8 is'positioned behind the IIOSe 23 0f cocked, even in cockedposition of the trigger the anchor 45- mechanism, that is to say the-smallarm is at full f new the t t however Slightly, 10

safety. or even given the lightest touch the arm 22 is In the accompanying drawings two embodireleased from the hook 2 i; the striker 23 hits the ments of the trigger mechanism according to the arm li rest e e t e a c or 4 out of invention are shown by way of exam le. 7 the hook'til of the hammer I and the latter is I l5 Figs. 1 and 2 are longitudinal sectional views swung fOI'WaId thereby discharging t e car 5 of one embodiment, wherein'the cocking lever and tridge-l t Will be Seen t the diSCharge'iS aetuthe trigger form one unit, i ally effected by thejspring 24 of the striker 23.. Figs. 3 and 4 are side elevation and plan View In this r nt e trigger i3 forms a unit. respectively of a member forming part of this Withtheievel Cooperating With the hair-triggerembodiment. V

7 Figs 5 and 6 are side elevatign and plan iew 2 land. iS COntI'O11ed.by the screw '6. of angther ;v The more the latter is screwed inwardly the Figs. '7 and 8 are longitudinal sectional views of Smaller is h Contact Surface between the two the second embodiment, wherein the cooking lever members" so h a pr p rtionately smaller;

and t trigger form Separate members lighter and quicker movement of the trigger will 25 Referring to Figs. 1 to 6, the harnmer l is 51153509 m the discharge Ofthe unsubjectto the action ofcoilspring 2 andis adapth rest 27 ofthe seal 3 i $0 p d that ed to rock together with the pin a the extremities when the Striker 23 is uncocked the p e sion of which are mounted in suitable bearings. The, "Spring 24 moves the Seal 8 into Such it n that anchor 4 is rotatable roundthe pivot 5 and" is e t 27 unable to e hind the nose 28 30 subject to'the action of the spring pressed plunger 0f the anchor he S ar 8 s unable tore- 6. The anchor operating rod or sear 8 is pivotal- 1994.59 the h This Condition, as ust ated 1y mounted by means'ofpin 9'on the arm vIt! in 2, is establhhed'afiier every firing, Since which is subject t t gtign of t pring the striker 23 then occupies its uncooked posi- Theekteht of the engagement between the hook pressed plunger 1 andisrockable round the pivot 'tion (1119 130' the discharge; In this condition 35 The trigger 13.7 pivoted on m 52 and s thereforethe gun is. at safety until the trigger coupled by means of a dog Clutch 4a, .(Figs. mechanism is Ire-cocked.

4 and 6) with the twoarined lever M. In the exrr ng to Figs. 7 and 8, this embodiment s tension :5 of the trigger I3 is disposed an 7 ad, substantially the same as that described with ref- 40 dusting screw it, whereby the hair-trigger-searw e ee to F gs. 1 to but t e trigger and the p 40 I9 maybe adjusted in amannerhereinafter defor cocking the heir-trigger ism form scribed. The scar. l9 isrockable round the pivot separate members. The trigger l3, in this em- !8 and is subject .to the action of spring 11. The bodiment, is provided with a retaining hook 3 adjusting screw lfi acts upon the arm 20 of the and a control arm 32 (Fig- 8).. dj the sear 19 the other arm'of which has afhoo-k 2|. latter is mounted the cooking lever 35, 36 (Fig. 45 r The striker 23is subject to the actionof coil spring 7) on the pivot l2 of the trigger in a snugly 24 and cooperates with the arm 25 of the two rotatable manner. The adjusting screw "3 acts armed lever I 4. The stroke ofthe striker is limupon the arm'32 which the spring 33 tends to ited by a pin 26. depress; A trigger-like lever 38 is provided for In operation, when the trigger is turned in a 7 cooking thestriker 23, the said lever 38 having 50 direction opposite to. the pull applied when firing, a cocking arm39 and a sear arm 42, the latter i, e. clockwise, the cooking arm 25 of the two engaging the retaining hook 3!. By turning the armed lever i4 is swung backwards due to the screw I6. more or less inwardly the contactbe-fl dog clutch 40, Al; the other arm 22 of the said tween the hook 3i and the arm 42 may be con- I two armed lever being simultaneously turned trolled in the same manner as in the first em- 55 bodiment. The cocking arm '39 acts upon the arm 36 of the previously mentioned cocking lever, while the arm 35 cooperates with the striker 23.

In operation, when a pull is exerted upon the trigger like lever 38 rearwardly, its cocking arm 39 efiects the cocking of striker 23 against the action of spring 24 through the two armed lever 35, 36, the sear arm 32. at the same, time falling under the hook 3l' of trigger l3, whereby the striker 23 is retained in its cockedposition due to the cooperation of retaining hook 3| and sear arm 42. Hereupon the lightest touch ex erted upon the trigger l3 suffices for terminating the slight engagement between members 3| and 62, the action being similar to that explained with reference to members 2| and 22 ofthe' embodiment according to Figs. 1 and 2, and thus the striker 23 which shoots forward under the action of spring 24 discharges the gun.

I claim:

In a hair-trigger mechanism for smallarms, a striker member adapted to discharge the smallarm, means adapted to retain said striker member in its cocked position, ;a sear adapted to actuate saidmeans in order to release the cooked striker member; another striker member adapted to actuate said sear, and a spring adapted to "actuate said second striker member, said secondstriker member being adapted to hold the sear disengaged from said means in unstretched 

